This file is indexed.

/usr/share/mime-info/dia.keys is in dia-common 0.97.2-15ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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application/x-dia-diagram:
	open=dia %f
	view=dia %f
	icon-filename=${prefix}/share/icons/hicolor/48x48/apps/dia.png